1 Configure I2C driver in the kernel
Linux-2.6.32.2 provides a complete driver for the I2C interface of S2C2440, so we only need to configure it in the kernel to use it.
Execute: make menuconfig in the kernel source code directory to enter the kernel configuration main menu, and select the following submenus in sequence:
Device Drivers --->
<*> I2C support --->
I2C Hardware Bus support --->
As shown in the figure, we can see that "<*> S3C2410 I2C Driver" has been selected here. The S3C2410 here can also be applied to S3C2440 because their I2C port and register definitions are exactly the same.
The driver source code corresponding to the above configuration is: linux-2.6.32.2/drivers/i2c/busses/i2c-s3c2410.c
2 Test I2C-EEPROM
Mini2440 In order to facilitate user testing, an EEPROM chip is mounted based on the I2C bus, which is AT24C08. By writing and reading this chip, we can test the I2C bus driver. Execute: make zImage in the kernel root directory, burn the generated new kernel into the development board, and still use the root_qtopoia provided by Friendly Arm, because it already contains the I2C-EEPROM test program
Enter in the command line: i2c –w to write data to the 24C08 device of the board (0x00-0xff)
Type in the command line: i2c –r to read the output from the 24C08 device on the board
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